Hi,
in the home page of presentation of K2 I read: "... 'drag and drop" ... media manager ".
But I can not find the way to do it. How do you activate. I would need in the back-end and front-end.
I need to drag and drop images to upload...
Can anyone tell me how to do it?
Thank you.

Simply go to Components -> K2 -> Media manager, drag an image and drop it over the media manager.
Unfortunately this media manager is not accessible in the front-end. Joomla!'s default media manager is used instead.

Thank you.
Do you know if there are any extension that they can manage drag and drop in the front end?
:S

I think you should look for replacement of the default media manager at the JED.